拼接JSON字符串

package jp.co.qualica.kcm.action.common;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.List;

public class JSONUtil {
    public static <T> String fromList(List<T> list) throws Throwable {
        StringBuilder json = new StringBuilder();

        if (list == null || list.size() == 0) {
            return null;
        }

        json.append("[");

        for(int i = 0; i < list.size(); i++) {
            json.append("{");
            T t = list.get(i);
            Class clazz = t.getClass();
            Field[] fields = t.getClass().getFields();
            for(int j=0; j<fields.length; j++) {
                Field field = fields[j];
                String strFields = field.getName();
                String getMethodName = "get"+ strFields.substring(0, 1).toUpperCase() + strFields.substring(1);
                Method method =clazz.getMethod(getMethodName, new Class[]{});
                Object value = method.invoke(t, new Object[]{});
                json.append("\"" + strFields + "\"" + ":" + "\"" + value + "\"");

                if (j < fields.length - 1) {
                    json.append(",");
                }
            }
            json.append("}");
            if (i < list.size() - 1) {
                json.append(",");
            }
        }

        json.append("]");

        return json.toString();
    }

}

// 如果是你现在的提问，你的 string 是 '*****'

 <script type="text/javascript">

     window.onload = function(){

         var itemString = "'{id:\"item1\",num:1},{id:\"item2\",num:2}'";

         if(itemString.length>2){

             itemString = itemString.substring(1,itemString.length-1);

             itemString = eval('([' + itemString + '])');

             alert(itemString);

         }

     }

 </script>

  

  

 // 这是对于你第一个发的问题的，确保你的问题是正确的，那【两边有单引号】 

 // 也就是 var str = "'{ *** }'";

 <script type="text/javascript">

    window.onload = function() {

        // 假设你的 string 如你所给的，是 ‘{string}’

        var itemString = "‘{id:'item1',num:1,id:'item2',num:2,id:'item3',num:3}’";

        if (itemString.length > 4) {

            // 先把 ‘{}’两个给去掉，剩下 id:'',num:1, id:'',num:2 ***

            itemString = itemString.substring(2, itemString.length - 2);

            // 还要假设你的数据一定是规则的 id:'',num:1 每2个是一组，都是用 , 来分隔的 

            // 这样就切出来了 id:''  num:1  id;'' num:2 的数组

            var arrs = itemString.split(',');

            var arrlen = arrs.length;

            var result = "";

            for (var i = 0; i < arrlen; i = i + 2) { 

                // 如果 result 不为空，则是已经拼接过 { id:'',num:* } 了，再拼接一个则要加上 ,

                if (result != "") {

                    result += ",";

                }

                // 最终结果拼接为 { id:'',num:* } , { id:'',num:* }

                result += "{" + arrs[i] + "," + arrs[i + 1] + "}";

            }

            // 最后拼接总的字符串 [ + { id:'',num:* } , { id:'',num:* } + ]

            result = "[" + result + "]";

            alert(result);

        }

    }

</script>